Bush's environment

Bush:

"New technologies will change how we live and how we drive our cars, which all will have the beneficial effect of improving the environment," Bush said. "And in my judgment we need to set aside whether or not greenhouse gases have been caused by mankind or because of natural effects and focus on the technologies that will enable us to live better lives and at the same time protect the environment."

A standard neoclassical line. But if you don't know which industrial and other causes contribute to climate change, how do you know which new technologies to pursue?